Log chipper



Oct. 20,"194`2. P. N. o'TTr-:RsLAND LOG CHIPPER Filed Jan. 13, 1940 i sive knives or blades.

` grooved portions between the knives.

aente Oct. 20, 1942 UNITED LOG CHIPPER Peter -N. Ottersland, Watertown, N. Y. Application January 13, i940, Serial No. 313,672

This invention relates to log chippers. Chippers usually consist of a rotary disk having a series of knives or blades, the log to be chipped being fed to the rotary cutter in an inclined feed spout or chute. As the knives are carried by the disk into engagement with the end of the log, the chips are cut therefrom. y

In the chippers now in common use, the knives are so spaced around the disk that only one knife or blade is performing its cutting or chipping function at any one time; Thus, there isa considerable space on the disk between the succes- As the knives engage and cut chips from the end of the log they tend to drawthe log downwardly in the chute and while the knife cuts the log and before the next knife comes into action there is a considerable 'pressure exerted between the end ofthe log and the surface of the disk. This causes the disk to wear, forming concaved or When the end of the log engages or moves into and leaves these grooved or concaved surfaces, it is kicked back and thus is not properly positioned for engagement by the knives. Furthermore, there is nothing in the chipper as now manufactured to engage and steady the log between successive cuts. As the knives engagethe log the. log tends to pivot about its lower edge since it usually does not entirely fill the feed spout and therefore jumps around, thus preventing effective action of theknives. y

'I'hls invention has for its salient object to provide a chipper so constructed and arranged that the chipping of the log will be expedited and' rendered more elcient.

Another object of the invention is to provide a chipper so constructed and arranged that the log will be held steady in the chute at all times during the chipping operation and the chipper Another object of the invention is to provide a knife for a chipper so constructed and arranged that chipsof Auniform width will be cu..

' Another object of the invention is to provide a construction of knife and chute so constructed and arranged that a plurality of knives will operate simultaneously on small logs as. well as on large logs. V

Further objects of the invention will appear from the following specincation taken in connectionwith the drawing which forms a part of this application, and in which M liig.V l is an elevational view partlyin section of a chipper disk and chute constructed in accordance with the. invention, this view being taken substantialy on line i-V-i of Fig. 2;

Fig. 2 kis a vertical sectional elevation through the discharge end of the chute;

Fig. 3 is a plan view of amodiiied form of f knife which may be used on the chipper illustrated in Figs. 1 and 2;

Fig. 4 is an end elevation of the knife shown in Fig. 3; and i Fig. 5 is an edge view of the knife shown in Fig. 3.

The invention briefly described comprises a chipper disk having a plurality of knives arranged symmetrically on the disk and extending there' in the chute to a position as near as possible tov the axis 0f the disk. This will insure the simulwill therefore produce chips of more uniform I length than are produced in machines of the con,-

ventional type.

Another object of the invention is to provide a spout so constructed and arranged that a log therein will take a position as near as possible to the axis of the chipper disk. l

Another object ofthe invention is to provide a chute and chipper disk or cutter so correlated that the setting of the knives on the disk and the cross section of the chute will cooperate in moving the log being cut to a position in the chute nearest the axis of the disk, thereby insuringthe simultaneous operation of a plurality of knives on the log.

taneous operation of a plurality of knives on the log since the portions of the knives nearer the disk axis are closer together than the, outer portions thereof. In other words, the knives as mounted diverse toward the periphery of the disk. 'Ihe invention also includes a stepped construction of knife which operates to cut chips of uniform width from the los.

Further details of the invention will appear from the following description.

y In the particular embodiment of the invention illustrated in the drawing, the chippencomprises a frame I0 mounted on a base Il and provided with suitable bearings for supporting a shaft l2 on which is mounted the chipper disk I3. The disk I3 has formed therein a plurality of slots I4 5 5 and in each slot there is mounted a knife I5.

Each knife is adiustable by means of a screw I6 and is locked in adjusted position by a bolt i1.

- cutting edfges of the knives are disposed tangentially to a circle C having the axis X of the shaft I2 as its center.

By means of the tangential arrangement toi? the knives the engagement ofaa knife with a log in the chute tends to draw the log toward the axis X oi' the shaft i2. -From the showing in Fig. 1

it will be noted that the knives diverge toward the periphery of the disk and therefore the portions of the/knives n'earer`the axis are closer together than the outer portions thereof. Because of this condition it is desirable to have the knives engage the log as close as possible to the axis X, thereby insuring the simultaneous engagement of a plurality ofknlves with the log. r I

In order tb further promote the condition described inthe preceding paragraph, the chute 20 which has its longitudinal axis and discharge end oifset from the axis X of the cutter, is so designed that the bottom 2| slopes downwardly and providesa pocket 22 for receiving the logs which are moved toward or into the pocket 22 by the action of the' knives thereon. The downward sloping bottom and pocket at the discharge end Vof the chute are formed by the bed knife 25.

Figs. 3, 4 and 5 show a modified form of knife which may be used to advantage with the chipper illustrated in Figs. 1 and 2. 'I'his knife has a serrated cutting edge 26 formed by a plurality of ledges 21. These ledges form in effect a plurality of independent cutting knives, each of which cuts a uniform width of chip and the use f this knife insures uniform chips. From the illustration in Fig. 5 it will be noted that each ledge 27 has its outer or cutting edge disposed in a different plane from the plane of the other edge and one end of each step or ledge is disposed in a difierent plane from the other end.

Fig. 1 illustrates in dotted lines various sizes of logs in the chute and it will be obvious from the foregoing description and from the illustration in the drawings that the chipper construction described insures the simultaneous engagement of a plurality of knives in the cutting oper-l l the construction and in the arrangement of the various cooperating partsmay be made without departing from the spirit and scope of the invention. asexpressed in the following claims.

What I claim is:

l. A log chipper of the type consisting of/a disk having a plurality of openings therethrough, a cutting knife adjacent each opening having its cutting edge disposed in a plane oilset fromthe disk axis and a downwardly inclined chutelfor feeding logs to the knives, in which the lower surface -of the chute is inclined downwardly 3. A log chipper as defined in claim 1 in which f the knives are spaced on the disk a distance less than the. distance between the top and bottom surfaces of the chute so that a plurality of knives will be simultaneously disposed opposite and will overlap the discharge end ofthe chute.

PETER. N. OTTERSLAND. 

